His campaign said he will speak at a rally at Cincinnati's Union Terminal. Romney and running mate Paul Ryan campaigned last Saturday in central Ohio before heading to the Republican National Convention this week in Tampa, Fla.

Meanwhile, Democratic Vice President Joe Biden will speak at Lordstown, in northeast Ohio on Friday, and President Barack Obama will be in Toledo and Cleveland on Labor Day.

Swing-state Ohio is a key battleground state for their general election race.

The historic Union Terminal has been the site for speeches by other political leaders in recent years. Biden spoke there during the 2008 campaign, Democratic nominee John Kerry was there in 2004, and President George W. Bush in 2002.